Hi I Am 24 Years Old Male. I Have Been

Hi I am 24 years old male. I have been feeling dizziness lately. My cousin who is a nursing student told me that It may be due to iron deficiency. I have been experiencing hairfall for the last few years. So when I shift to a iron supplementing diet my hair fall decreased significantly. Since I moved into a hostel its very difficult for me to maintain my diet. So everything relapsed. So I want to know that if the hairfall and dizziness was due to iron deficiency and if I could take any iron supplement tablets? Is there any harm in taking such tablets? Could you please refer any such iron tablets?